As you will see, I have requested precisely this clarification for U+0184/0185, to clarify that this letter is used in pan-Turkic alphabets as well as in Zhuang. I am also asking for a change in the reference glyph for U+0185, because in both Zhuang and pan-Turkic this should be much shorter, and distinguished from "b" primarily by its size.
In Pan-Turkic, though, it looks just like CYRILLIC SOFT SIGN in all the sources I have seen. For lots of languages.
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Michael Everson * * Everson Typography * * http://www.evertype.com
